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class="nav-list-link">Kerberoasting</a><li class="nav-list-item active"><a href="/docs/pentesting/active-directory/kerberos/keytab.html" class="nav-list-link">Keytab support and decrypting wireshark traffic</a><li class="nav-list-item active"><a href="/docs/pentesting/active-directory/kerberos/rbcd.html" class="nav-list-link">Resource-based constrained delegation (RBCD)</a><li class="nav-list-item active"><a href="/docs/pentesting/active-directory/kerberos/unconstrained_delegation.html" class="nav-list-link">Unconstrained delegation</a></ul></ul></ul><li class="nav-list-item active"><a href="#" class="nav-list-expander"><svg viewBox="0 0 24 24"><use xlink:href="#svg-arrow-right"></use></svg></a><a href="/docs/using-metasploit/" class="nav-list-link">Using Metasploit</a><ul class="nav-list"><li class="nav-list-item active"><a href="#" class="nav-list-expander"><svg viewBox="0 0 24 24"><use xlink:href="#svg-arrow-right"></use></svg></a><a href="/docs/using-metasploit/getting-started/" 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href="/docs/using-metasploit/basics/how-payloads-work.html" class="nav-list-link">How payloads work</a><li class="nav-list-item active"><a href="/docs/using-metasploit/basics/module-documentation.html" class="nav-list-link">Module Documentation</a><li class="nav-list-item active"><a href="/docs/using-metasploit/basics/how-to-use-a-reverse-shell-in-metasploit.html" class="nav-list-link">How to use a reverse shell in Metasploit</a><li class="nav-list-item active"><a href="/docs/using-metasploit/basics/how-to-use-msfvenom.html" class="nav-list-link">How to use msfvenom</a><li class="nav-list-item active"><a href="/docs/using-metasploit/basics/managing-sessions.html" class="nav-list-link">Managing Sessions</a></ul><li class="nav-list-item active"><a href="#" class="nav-list-expander"><svg viewBox="0 0 24 24"><use xlink:href="#svg-arrow-right"></use></svg></a><a href="/docs/using-metasploit/intermediate/" class="nav-list-link">Intermediate</a><ul class="nav-list"><li class="nav-list-item active"><a href="/docs/using-metasploit/intermediate/metasploit-database-support.html" class="nav-list-link">Database Support</a><li class="nav-list-item active"><a href="/docs/using-metasploit/intermediate/evading-anti-virus.html" class="nav-list-link">Evading Anti Virus</a><li class="nav-list-item active"><a href="/docs/using-metasploit/intermediate/exploit-ranking.html" class="nav-list-link">Exploit Ranking</a><li class="nav-list-item active"><a href="/docs/using-metasploit/intermediate/hashes-and-password-cracking.html" class="nav-list-link">Hashes and Password Cracking</a><li class="nav-list-item active"><a href="/docs/using-metasploit/intermediate/how-to-use-plugins.html" class="nav-list-link">Metasploit Plugins</a><li class="nav-list-item active"><a href="/docs/using-metasploit/intermediate/payload-uuid.html" class="nav-list-link">Payload UUID</a><li class="nav-list-item active"><a href="/docs/using-metasploit/intermediate/pivoting-in-metasploit.html" class="nav-list-link">Pivoting in Metasploit</a><li class="nav-list-item active"><a href="/docs/using-metasploit/intermediate/running-private-modules.html" class="nav-list-link">Running Private Modules</a></ul><li class="nav-list-item active"><a href="#" class="nav-list-expander"><svg viewBox="0 0 24 24"><use xlink:href="#svg-arrow-right"></use></svg></a><a href="/docs/using-metasploit/advanced/" class="nav-list-link">Advanced</a><ul class="nav-list"><li class="nav-list-item active"><a href="/docs/using-metasploit/advanced/how-to-configure-dns.html" class="nav-list-link">How to Configure DNS</a><li class="nav-list-item active"><a href="/docs/using-metasploit/advanced/metasploit-web-service.html" class="nav-list-link">Metasploit Web Service</a><li class="nav-list-item active"><a href="#" class="nav-list-expander"><svg viewBox="0 0 24 24"><use xlink:href="#svg-arrow-right"></use></svg></a><a href="/docs/using-metasploit/advanced/meterpreter/" class="nav-list-link">Meterpreter</a><ul class="nav-list"><li class="nav-list-item active"><a href="/docs/using-metasploit/advanced/meterpreter/meterpreter.html" class="nav-list-link">Overview</a><li class="nav-list-item active"><a href="/docs/using-metasploit/advanced/meterpreter/meterpreter-configuration.html" class="nav-list-link">Configuration</a><li class="nav-list-item active"><a href="/docs/using-metasploit/advanced/meterpreter/debugging-dead-meterpreter-sessions.html" class="nav-list-link">Debugging Dead Meterpreter Sessions</a><li class="nav-list-item active"><a href="/docs/using-metasploit/advanced/meterpreter/meterpreter-debugging-meterpreter-sessions.html" class="nav-list-link">Debugging Meterpreter Sessions</a><li class="nav-list-item active"><a href="/docs/using-metasploit/advanced/meterpreter/meterpreter-executebof-command.html" class="nav-list-link">ExecuteBof Command</a><li class="nav-list-item active"><a href="/docs/using-metasploit/advanced/meterpreter/meterpreter-http-communication.html" class="nav-list-link">HTTP Communication</a><li class="nav-list-item active"><a href="/docs/using-metasploit/advanced/meterpreter/how-to-get-started-with-writing-a-meterpreter-script.html" class="nav-list-link">How to get started with writing a Meterpreter script</a><li class="nav-list-item active"><a href="/docs/using-metasploit/advanced/meterpreter/meterpreter-paranoid-mode.html" class="nav-list-link">Paranoid Mode</a><li class="nav-list-item active"><a href="/docs/using-metasploit/advanced/meterpreter/powershell-extension.html" class="nav-list-link">Powershell Extension</a><li class="nav-list-item active"><a href="/docs/using-metasploit/advanced/meterpreter/python-extension.html" class="nav-list-link">Python Extension</a><li class="nav-list-item active"><a href="/docs/using-metasploit/advanced/meterpreter/meterpreter-reg-command.html" class="nav-list-link">Reg Command</a><li class="nav-list-item active"><a href="/docs/using-metasploit/advanced/meterpreter/meterpreter-reliable-network-communication.html" class="nav-list-link">Reliable Network Communication</a><li class="nav-list-item active"><a href="/docs/using-metasploit/advanced/meterpreter/meterpreter-sleep-control.html" class="nav-list-link">Sleep Control</a><li class="nav-list-item active"><a href="/docs/using-metasploit/advanced/meterpreter/meterpreter-stageless-mode.html" class="nav-list-link">Stageless Mode</a><li class="nav-list-item active"><a href="/docs/using-metasploit/advanced/meterpreter/the-ins-and-outs-of-http-and-https-communications-in-meterpreter-and-metasploit-stagers.html" class="nav-list-link">The ins and outs of HTTP and HTTPS communications in Meterpreter and Metasploit Stagers</a><li class="nav-list-item active"><a href="/docs/using-metasploit/advanced/meterpreter/meterpreter-timeout-control.html" class="nav-list-link">Timeout Control</a><li class="nav-list-item active"><a href="/docs/using-metasploit/advanced/meterpreter/meterpreter-transport-control.html" class="nav-list-link">Transport Control</a><li class="nav-list-item active"><a href="/docs/using-metasploit/advanced/meterpreter/meterpreter-unicode-support.html" class="nav-list-link">Unicode Support</a><li class="nav-list-item active"><a href="/docs/using-metasploit/advanced/meterpreter/meterpreter-wishlist.html" class="nav-list-link">Wishlist</a></ul><li class="nav-list-item active"><a href="#" class="nav-list-expander"><svg viewBox="0 0 24 24"><use xlink:href="#svg-arrow-right"></use></svg></a><a href="/docs/using-metasploit/advanced/RPC/" class="nav-list-link">RPC</a><ul class="nav-list"><li class="nav-list-item active"><a href="/docs/using-metasploit/advanced/RPC/how-to-use-metasploit-json-rpc.html" class="nav-list-link">How to use Metasploit JSON RPC</a><li class="nav-list-item active"><a href="/docs/using-metasploit/advanced/RPC/how-to-use-metasploit-messagepack-rpc.html" class="nav-list-link">How to use Metasploit Messagepack RPC</a></ul></ul><li class="nav-list-item active"><a href="#" class="nav-list-expander"><svg viewBox="0 0 24 24"><use xlink:href="#svg-arrow-right"></use></svg></a><a href="/docs/using-metasploit/other/" class="nav-list-link">Other</a><ul class="nav-list"><li class="nav-list-item active"><a href="/docs/using-metasploit/other/how-to-use-metasploit-mcp-server.html" class="nav-list-link">How to use Metasploit MCP Server</a><li class="nav-list-item active"><a href="/docs/using-metasploit/other/how-to-use-metasploit-with-ngrok.html" class="nav-list-link">How to use Metasploit with ngrok</a><li class="nav-list-item active"><a href="/docs/using-metasploit/other/how-to-use-the-favorite-command.html" class="nav-list-link">How to use the Favorite command</a><li class="nav-list-item active"><a href="/docs/using-metasploit/other/information-about-unmet-browser-exploit-requirements.html" class="nav-list-link">Information About Unmet Browser Exploit Requirements</a><li class="nav-list-item active"><a href="#" class="nav-list-expander"><svg viewBox="0 0 24 24"><use xlink:href="#svg-arrow-right"></use></svg></a><a href="/docs/using-metasploit/other/oracle-support/" class="nav-list-link">Oracle Support</a><ul class="nav-list"><li class="nav-list-item active"><a href="/docs/using-metasploit/other/oracle-support/how-to-get-oracle-support-working-with-kali-linux.html" class="nav-list-link">How to get Oracle Support working with Kali Linux</a><li class="nav-list-item active"><a href="/docs/using-metasploit/other/oracle-support/oracle-usage.html" class="nav-list-link">Oracle Usage</a></ul><li class="nav-list-item active"><a href="/docs/using-metasploit/other/why-cve-is-not-available.html" class="nav-list-link">Why CVE is not available</a></ul></ul><li class="nav-list-item active"><a href="#" class="nav-list-expander"><svg viewBox="0 0 24 24"><use xlink:href="#svg-arrow-right"></use></svg></a><a href="/docs/development/" class="nav-list-link active">Development</a><ul class="nav-list"><li class="nav-list-item active"><a href="#" class="nav-list-expander"><svg viewBox="0 0 24 24"><use xlink:href="#svg-arrow-right"></use></svg></a><a href="/docs/development/get-started/" class="nav-list-link">Get Started</a><ul class="nav-list"><li class="nav-list-item active"><a href="/docs/development/get-started/contributing-to-metasploit.html" class="nav-list-link">Contributing to Metasploit</a><li class="nav-list-item active"><a href="/docs/development/get-started/creating-your-first-pr.html" class="nav-list-link">Creating Your First PR</a><li class="nav-list-item active"><a href="/docs/development/get-started/setting-up-a-metasploit-development-environment.html" class="nav-list-link">Setting Up a Metasploit Development Environment</a><li class="nav-list-item active"><a href="/docs/development/get-started/sanitizing-pcaps.html" class="nav-list-link">Sanitizing PCAPs</a><li class="nav-list-item active"><a href="#" 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xlink:href="#svg-search"></use></svg></label></div><div id="search-results" class="search-results"></div></div><link rel="stylesheet" href="/assets/css/main.css"><nav aria-label="Auxiliary" class="aux-nav"><ul class="aux-nav-list"><li class="aux-nav-list-item"> <a href="//github.com/rapid7/metasploit-framework" class="site-button" target="_blank" rel="noopener noreferrer" > Metasploit Framework on GitHub </a></ul></nav></div><div id="main-content-wrap" class="main-content-wrap"><nav aria-label="Breadcrumb" class="breadcrumb-nav"><ol class="breadcrumb-nav-list"><li class="breadcrumb-nav-list-item"> <a href="/docs/development/">Development</a><li class="breadcrumb-nav-list-item"> <a href="/docs/development/developing-modules/">Developing Modules</a><li class="breadcrumb-nav-list-item"> <a href="/docs/development/developing-modules/guides/">Guides</a><li class="breadcrumb-nav-list-item"> <span>Writing an exploit</span></ol></nav><div id="main-content" class="main-content" role="main"><h2 id="on-this-page"> <a href="#on-this-page" class="anchor-heading" aria-labelledby="on-this-page"><svg viewBox="0 0 16 16" aria-hidden="true"><use xlink:href="#svg-link"></use></svg></a> On this page</h2><ul><li><a href="#plan-your-module">Plan your module</a><li><a href="#ranking">Ranking</a><li><a href="#template">Template</a><li><a href="#basic-git-commands">Basic git commands</a><li><a href="#references">References</a></ul><p>The real kung-fu behind exploit development isn’t actually about which language you choose to build it; it’s about your precise understanding of how input is processed by the application you’re debugging, and how to gain control by manipulating it. That’s right; the keyword is “debugging.” Your binjitsu (reverse-engineering) is where the real kung-fu is. However, if your goal isn’t just about popping a calculator, but actually want to weaponize, to maintain, and to provide use in the practical world, you need a development framework. And this is where Metasploit comes in. It’s a framework that’s free and open-source, actively contributed by researchers around the world. So when you write a Metasploit exploit, you don’t have to worry about any <a href="http://en.wikipedia.org/wiki/Dependency_hell">dependency issues</a>, or having the wrong version, or not having enough payloads for different pentesting scenarios to choose from, etc. The idea is all you need to do is focus on building that exploit, and nothing more.</p><h2 id="plan-your-module"> <a href="#plan-your-module" class="anchor-heading" aria-labelledby="plan-your-module"><svg viewBox="0 0 16 16" aria-hidden="true"><use xlink:href="#svg-link"></use></svg></a> Plan your module</h2><p>First, ask yourself will exploiting this vulnerability result in executing a payload? If not, then despite exploiting a vulnerability, for Metasploit’s purposes the module would fall into the <a href="/docs/development/developing-modules/guides/how-to-get-started-with-writing-an-auxiliary-module.html">auxiliary</a> category.</p><p>Unlike writing a proof-of-concept, when you write a Metasploit module, you need to think about how users might use it in the real world. Stealth is usually an important element to think about. Can your exploit achieve code execution without dropping a file? Can the input look more random, so it’s more difficult to detect? How about obfuscation? Is it generating unnecessary traffic? Can it be more stable without crashing the system?</p><p>Try to be precise about exploitable requirements. Usually, a bug is specific to a range of versions or even builds. If you can’t automatically check that, you need to at least mention it in the description somewhere.</p><p>Some of your exploit’s techniques might also be application-specific. For example, you can take advantage of a specific behavior in the application to generate heap allocations the way you want, but maybe it’s noisier in the newer version, so that gives you some stability issues. Does it need a 3rd-party component to work that may not even be installed by everyone? Even if it is, is the component revised often enough that it could make your exploit less reliable?</p><p>Know that in the real world, your exploit can break or fail in a lot of different ways. You should try to find out and fix it during the development and testing phase before learning the hard way.</p><h2 id="ranking"> <a href="#ranking" class="anchor-heading" aria-labelledby="ranking"><svg viewBox="0 0 16 16" aria-hidden="true"><use xlink:href="#svg-link"></use></svg></a> Ranking</h2><p>As you can see, reliability is important to Metasploit, and we try to be more friendly about this for the users. I know what you’re thinking: “Well, if they’re using the exploit, they should understand how it works, so they know what they’re getting themselves into.” In the perfect world, yes. Knowing how a vulnerability works or how an exploit works will only benefit the user, but you see, we don’t live in the perfect world. If you’re in the middle of a penetration test, it’s very unlikely to always find the time to recreate the vulnerable environment, strip the exploit to the most basic form to debug what’s going on, and then do testing. Chances are you have a tight schedule to break into a large network, so you need to use your time carefully. Because of this, it’s important to at least have a good description and good references for the module. And of course, a ranking system that can be trusted.</p><p>The Metasploit Framework has seven different rankings to indicate how reliable an exploit is. See <a href="/docs/using-metasploit/intermediate/exploit-ranking.html">Exploit Ranking</a> for more details.</p><h2 id="template"> <a href="#template" class="anchor-heading" aria-labelledby="template"><svg viewBox="0 0 16 16" aria-hidden="true"><use xlink:href="#svg-link"></use></svg></a> Template</h2><p>If you have read this far, we think you are pretty impressive because it’s a lot to digest. You are probably wondering why we haven’t had a single line of code to share in the writeup. Well, as you recall, exploit development is mostly about your reversing skills. If you have all that, we shouldn’t be telling you how to write an exploit. What we’ve done so far is hopefully get your mindset dialed-in correctly about what it means to become a Metasploit exploit developer for the security community; the rest is more about how to use our mixins to build that exploit. Well, there are A LOT of mixins, so it’s impossible to go over all of them in a single page, so you must either read the <a href="https://docs.metasploit.com/api/">API documentation</a>, existing <a href="https://github.com/rapid7/metasploit-framework/tree/master/modules/exploits">code examples</a>, or look for more wiki pages we’ve written to cover specific mixins.</p><p>For example, if you’re looking for a writeup about how to interact with an HTTP server, you might be interested in: <a href="/docs/development/developing-modules/guides/how-to-write-a-browser-exploit-using-httpserver.html">How to send an HTTP Request Using HTTPClient</a>. If you’re interested in browser exploit writing, definitely check out: <a href="/docs/development/developing-modules/libraries/http/how-to-write-a-browser-exploit-using-browserexploitserver.html">How to write a browser exploit using BrowserExploitServer</a>, etc.</p><p>But of course, to begin, you most likely need a template to work with, and here it is. We’ll also explain how to fill out the required fields:</p><div class="language-ruby highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="c1">##</span>
<span class="c1"># This module requires Metasploit: https://metasploit.com/download</span>
<span class="c1"># Current source: https://github.com/rapid7/metasploit-framework</span>
<span class="c1">##</span>
<span class="k">class</span> <span class="nc">MetasploitModule</span> <span class="o">&lt;</span> <span class="no">Msf</span><span class="o">::</span><span class="no">Exploit</span><span class="o">::</span><span class="no">Remote</span>
<span class="no">Rank</span> <span class="o">=</span> <span class="no">NormalRanking</span>
<span class="k">def</span> <span class="nf">initialize</span><span class="p">(</span><span class="n">info</span> <span class="o">=</span> <span class="p">{})</span>
<span class="k">super</span><span class="p">(</span>
<span class="n">update_info</span><span class="p">(</span>
<span class="n">info</span><span class="p">,</span>
<span class="s1">'Name'</span> <span class="o">=&gt;</span> <span class="s1">'[Vendor] [Software] [Root Cause] [Vulnerability type]'</span><span class="p">,</span>
<span class="s1">'Description'</span> <span class="o">=&gt;</span> <span class="sx">%q{
Say something that the user might need to know
}</span><span class="p">,</span>
<span class="s1">'License'</span> <span class="o">=&gt;</span> <span class="no">MSF_LICENSE</span><span class="p">,</span>
<span class="s1">'Author'</span> <span class="o">=&gt;</span> <span class="p">[</span> <span class="s1">'Name'</span> <span class="p">],</span>
<span class="s1">'References'</span> <span class="o">=&gt;</span> <span class="p">[</span>
<span class="p">[</span> <span class="s1">'URL'</span><span class="p">,</span> <span class="s1">''</span> <span class="p">]</span>
<span class="p">],</span>
<span class="s1">'Platform'</span> <span class="o">=&gt;</span> <span class="s1">'win'</span><span class="p">,</span>
<span class="s1">'Targets'</span> <span class="o">=&gt;</span> <span class="p">[</span>
<span class="p">[</span>
<span class="s1">'System or software version'</span><span class="p">,</span>
<span class="p">{</span>
<span class="s1">'Ret'</span> <span class="o">=&gt;</span> <span class="mh">0x41414141</span> <span class="c1"># This will be available in `target.ret`</span>
<span class="p">}</span>
<span class="p">]</span>
<span class="p">],</span>
<span class="s1">'Payload'</span> <span class="o">=&gt;</span> <span class="p">{</span>
<span class="s1">'BadChars'</span> <span class="o">=&gt;</span> <span class="s2">"</span><span class="se">\x00</span><span class="s2">"</span>
<span class="p">},</span>
<span class="s1">'Privileged'</span> <span class="o">=&gt;</span> <span class="kp">false</span><span class="p">,</span>
<span class="s1">'DisclosureDate'</span> <span class="o">=&gt;</span> <span class="s1">''</span><span class="p">,</span>
<span class="s1">'DefaultTarget'</span> <span class="o">=&gt;</span> <span class="mi">0</span><span class="p">,</span>
<span class="s1">'Notes'</span> <span class="o">=&gt;</span> <span class="p">{</span>
<span class="s1">'Stability'</span> <span class="o">=&gt;</span> <span class="p">[</span><span class="no">CRASH_SAFE</span><span class="p">],</span>
<span class="s1">'Reliability'</span> <span class="o">=&gt;</span> <span class="p">[</span><span class="no">REPEATABLE_SESSION</span><span class="p">],</span>
<span class="s1">'SideEffects'</span> <span class="o">=&gt;</span> <span class="p">[</span><span class="no">ARTIFACTS_ON_DISK</span><span class="p">,</span> <span class="no">IOC_IN_LOGS</span><span class="p">]</span>
<span class="p">},</span>
<span class="p">)</span>
<span class="p">)</span>
<span class="k">end</span>
<span class="k">def</span> <span class="nf">check</span>
<span class="c1"># For the check command</span>
<span class="k">end</span>
<span class="k">def</span> <span class="nf">exploit</span>
<span class="c1"># Main function</span>
<span class="k">end</span>
<span class="k">end</span>
</code></pre></div></div><ul><li><p><strong>Name</strong> - The Name field should begin with the name of the vendor, followed by the software. Ideally, the “Root Cause” field means which component or function the bug is found. And finally, the type of vulnerability the module is exploiting.</p><li><p><strong>Description</strong> - The Description field should explain what the module does, things to watch out for, specific requirements, the more, the better. The goal is to let the user understand what he’s using without the need to actually read the module’s source and figure things out. And trust me, most of them don’t.</p><li><p><strong>Author</strong> field is where you put your name. The format should be “Name “. If you want to have your Twitter handle there, leave it as a comment, for example: “Name # handle”</p><li><p><strong>References</strong> - The References field is an array of <a href="https://github.com/rapid7/metasploit-framework/blob/master/lib/msf/core/module/reference.rb">references</a> related to the vulnerability or the exploit. For example, an advisory, a blog post, etc. Make sure you use known reference identifiers – see <a href="/docs/development/developing-modules/module-metadata/module-reference-identifiers.html">Module reference identifiers</a> for a list.</p><li><p><strong>Platform</strong> - The Platform field indicates what platforms are supported, for example: win, linux, osx, unix, bsd.</p><li><p><strong>Targets</strong> - The Targets field is an array of systems, applications, setups, or specific versions your exploit is targeting. The second element or each target array is where you store specific metadata about that target, for example, a specific offset, a gadget, a ret address, etc. When a target is selected by the user, the metadata is loaded and tracked by a “target index”, and can be retrieved by using the <code class="language-plaintext highlighter-rouge">target</code> method.</p><li><p><strong>Payloads</strong> - The Payloads field specifies how the payload should be encoded and generated. You can specify: <code class="language-plaintext highlighter-rouge">Space</code>, <code class="language-plaintext highlighter-rouge">SaveRegisters</code>, <code class="language-plaintext highlighter-rouge">Prepend</code>, <code class="language-plaintext highlighter-rouge">PrependEncoder</code>, <code class="language-plaintext highlighter-rouge">BadChars</code>, <code class="language-plaintext highlighter-rouge">Append</code>, <code class="language-plaintext highlighter-rouge">AppendEncoder</code>, <code class="language-plaintext highlighter-rouge">MaxNops</code>, <code class="language-plaintext highlighter-rouge">MinNops</code>, <code class="language-plaintext highlighter-rouge">Encoder</code>, <code class="language-plaintext highlighter-rouge">Nop</code>, <code class="language-plaintext highlighter-rouge">EncoderType</code>, <code class="language-plaintext highlighter-rouge">EncoderOptions</code>, <code class="language-plaintext highlighter-rouge">ExtendedOptions</code>, <code class="language-plaintext highlighter-rouge">EncoderDontFallThrough</code>.</p><li><p><strong>DisclosureDate</strong> - The DisclosureDate is about when the vulnerability was disclosed in public, in the format of: “M D Y”. For example: “Apr 04 2014”</p><li><p><strong>Notes</strong> - The Notes field is a hash always containing three keys. The value of each key is an array of constants. The list of available constants can be found in the <a href="/docs/development/developing-modules/module-metadata/definition-of-module-reliability-side-effects-and-stability.html">Definition of Module Reliability Side Effects and Stability</a>. The key should be present even if the array is empty.</p><ul><li><strong>Stability</strong> - The Stability field describes how the exploit affects the system it’s being run on, ex: <code class="language-plaintext highlighter-rouge">CRASH_SAFE</code>, <code class="language-plaintext highlighter-rouge">CRASH_OS_DOWN</code><li><strong>Reliability</strong> - The Reliability field describes how reliable the session is that gets returned by the exploit, ex: <code class="language-plaintext highlighter-rouge">REPEATABLE_SESSION</code>, <code class="language-plaintext highlighter-rouge">UNRELIABLE_SESSION</code><li><strong>SideEffects</strong> - The SideEffects field describes the side effects caused by the exploit that the user should be aware of, ex: <code class="language-plaintext highlighter-rouge">ARTIFACTS_ON_DISK</code>, <code class="language-plaintext highlighter-rouge">IOC_IN_LOGS</code>, <code class="language-plaintext highlighter-rouge">ACCOUNT_LOCKOUTS</code>.</ul></ul><h3 id="non-required-fields"> <a href="#non-required-fields" class="anchor-heading" aria-labelledby="non-required-fields"><svg viewBox="0 0 16 16" aria-hidden="true"><use xlink:href="#svg-link"></use></svg></a> Non-required fields</h3><ul><li><p><strong>Stance</strong> - The types of stances an exploit can take, such as passive or aggressive. Stances indicate whether or not the module triggers the exploit without waiting for one or more conditions to be met (aggressive) or whether it must wait for certain conditions to be satisfied before the exploit can be initiated (passive). Passive exploits usually would wait for interaction from a client or other entity for being able to trigger the vulnerability.</p><li><p><strong>Passive</strong> - Either <code class="language-plaintext highlighter-rouge">true</code> or <code class="language-plaintext highlighter-rouge">false</code> indicates whether or not the exploit should be run as a background job. If for example you know the vulnerability takes an hour to trigger, setting <code class="language-plaintext highlighter-rouge">Passive</code> to <code class="language-plaintext highlighter-rouge">true</code> would be beneficial as it allows the user to continue using msfconsole while waiting for a response from the exploit.</p></ul><p>Your exploit should also have a <code class="language-plaintext highlighter-rouge">check</code> method to support the check command, but this is optional in case it’s not possible.</p><p>And finally, the <code class="language-plaintext highlighter-rouge">exploit</code> method is like your main method. Start writing your code there.</p><p>An example exploit module is also available: <a href="https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/example.rb">example.rb</a></p><h2 id="basic-git-commands"> <a href="#basic-git-commands" class="anchor-heading" aria-labelledby="basic-git-commands"><svg viewBox="0 0 16 16" aria-hidden="true"><use xlink:href="#svg-link"></use></svg></a> Basic git commands</h2><p>Metasploit no longer uses svn for source code management. Instead, we use git, so knowing some tricks with git go a long way. We’re not here to lecture you about how awesome git is; we know it has a learning curve, and it’s not surprising to find new users making mistakes. Every once a while, your git “rage” will kick in, and we understand. However, it’s important for you to take advantage of branching.</p><p>Every time you make a module or make some changes to existing code, you should not do so on the default master branch. Why? Because when you do a <code class="language-plaintext highlighter-rouge">msfupdate</code>, which is Metasploit’s utility for updating your repository, it will do a git reset before merging the changes, and all your code goes away.</p><p>Another mistake people tend to do is have all the changes on master before submitting a pull request. This is a bad idea because most likely; you’re submitting other crap you don’t intend to change, or you’re probably asking us to merge other unnecessary commit histories when there only needs to be one commit. Thanks for contributing your module to the community, but no thanks to your crazy commit history.</p><p>So as a habit, when you want to make something new, or change something, begin with a new branch that’s up to date to master. First off, make sure you’re on master. If you do a <code class="language-plaintext highlighter-rouge">git status</code> it will tell you what branch you’re currently on:</p><div class="language-bash highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nv">$ </span>git status
<span class="c"># On branch upstream-master</span>
nothing to commit, working directory clean
</code></pre></div></div><p>Ok, now do a <code class="language-plaintext highlighter-rouge">git pull</code> to download the latest changes from Metasploit:</p><div class="language-bash highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nv">$ </span>git pull
Already up-to-date.
</code></pre></div></div><p>At this point, you’re ready to start a new branch. In this case, we’ll name our new branch “my_awesome_branch”:</p><div class="language-bash highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nv">$ </span>git checkout <span class="nt">-b</span> my_awesome_branch
Switched to a new branch <span class="s1">'my_awesome_branch'</span>
</code></pre></div></div><p>And then you can go ahead and add that module. Make sure it’s in the appropriate path:</p><div class="language-bash highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nv">$ </span>git add <span class="o">[</span>module path]
</code></pre></div></div><p>When you decide to save the changes, commit (if there’s only one module, you can do <code class="language-plaintext highlighter-rouge">git commit -a</code> too so you don’t have to type the module path. Note <code class="language-plaintext highlighter-rouge">-a</code> really means EVERYTHING):</p><div class="language-bash highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nv">$ </span>git commit <span class="o">[</span>module path]
</code></pre></div></div><p>When you’re done, push your changes, which will upload your code to your remote branch “my_awesome_branch”. You must push your changes in order to submit the pull request or share it with others on the Internet.</p><div class="language-bash highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nv">$ </span>git push origin my_awesome_branch
</code></pre></div></div><h2 id="references"> <a href="#references" class="anchor-heading" aria-labelledby="references"><svg viewBox="0 0 16 16" aria-hidden="true"><use xlink:href="#svg-link"></use></svg></a> References</h2><ul><li><a href="https://github.com/rapid7/metasploit-framework/blob/master/lib/msf/core/exploit.rb">https://github.com/rapid7/metasploit-framework/blob/master/lib/msf/core/exploit.rb</a></ul><hr><footer><p><a href="#top" id="back-to-top">Back to top</a></p><p class="text-small text-grey-dk-000 mb-0"> <a href="https://github.com/rapid7/metasploit-framework/tree/master/docs/metasploit-framework.wiki/Get-Started-Writing-an-Exploit.md" id="edit-this-page">Edit this page on GitHub</a></p></footer></div></div><div class="search-overlay"></div></div><script type="text/javascript" src="/assets/js/toggle_mode.js"></script> <script> var config = { theme: 'default', logLevel: 'fatal', securityLevel: 'strict', startOnLoad: true, arrowMarkerAbsolute: false, er: { diagramPadding: 20, layoutDirection: 'TB', minEntityWidth: 100, minEntityHeight: 75, entityPadding: 15, stroke: 'gray', fill: 'honeydew', fontSize: 12, useMaxWidth: true, }, flowchart:{ diagramPadding: 8, htmlLabels: true, curve: 'basis', }, sequence: { diagramMarginX: 50, diagramMarginY: 10, actorMargin: 50, width: 150, height: 65, boxMargin: 10, boxTextMargin: 5, noteMargin: 10, messageMargin: 35, messageAlign: 'center', mirrorActors: true, bottomMarginAdj: 1, useMaxWidth: true, rightAngles: false, showSequenceNumbers: false, }, gantt: { titleTopMargin: 25, barHeight: 20, barGap: 4, topPadding: 50, leftPadding: 75, fontSize: 11, gridLineStartPadding: 35, fontFamily: '\'Open Sans\', sans-serif', numberSectionStyles: 4, axisFormat: '%Y-%m-%d', topAxis: false, }, }; mermaid.initialize(config); window.mermaid.init(undefined, document.querySelectorAll('.language-mermaid')); </script>
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